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Note 7 - Long-term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | May 21, 2020 | Dec. 31, 2019 | Dec. 03, 2019 | Jun. 25, 2018 | Mar. 28, 2016
--- | --- | --- | --- | --- | --- | ---
Long-term debt, outstanding principal | $ 3,949,823 |  | $ 3,813,956 |  |  |
Long-term debt, unamortized discount | (472) |  | (671) |  |  |
Long-term debt, unamortized original fees and costs | (51,868) |  | (47,354) |  |  |
Long-term debt, net | 3,897,483 |  | 3,765,931 |  |  |
Long-term debt, outstanding principal, current | 30,740 |  | 26,994 |  |  |
Long-term debt, unamortized discount, current | 0 |  | 0 |  |  |
Long-term debt, unamortized original fees and costs, current | 0 |  | 0 |  |  |
Current maturities of long-term debt | 30,740 |  | 26,994 |  |  |
Long-term debt, outstanding principal, noncurrent | 3,919,083 |  | 3,786,962 |  |  |
Long-term debt, unamortized discount, noncurrent | (472) |  | (671) |  |  |
Long-term debt, unamortized original fees and costs, noncurrent | (51,868) |  | (47,354) |  |  |
Long-term debt, net of current maturities and debt issuance costs | $ 3,866,743 |  | $ 3,738,937 |  |  |
Line of Credit [Member] | Bank Credit Facility [Member] |  |  |  |  |  |
Long-term debt, interest rate | 2.486% |  | 3.753% |  |  |
Long-term debt, outstanding principal | $ 896,185 |  | $ 1,305,634 |  |  |
Long-term debt, unamortized discount | (472) |  | (671) |  |  |
Long-term debt, unamortized original fees and costs | (12,924) |  | (14,255) |  |  |
Long-term debt, net | $ 882,789 |  | $ 1,290,708 |  |  |
Senior Notes [Member] | Senior Notes 6.375% Due 2026 [Member] |  |  |  |  |  |
Long-term debt, interest rate | 6.375% |  | 6.375% |  |  | 6.375%
Long-term debt, outstanding principal | $ 750,000 |  | $ 750,000 |  |  |
Long-term debt, unamortized discount | 0 |  | 0 |  |  |
Long-term debt, unamortized original fees and costs | (6,947) |  | (8,271) |  |  |
Long-term debt, net | $ 743,053 |  | $ 741,729 |  |  |
Senior Notes [Member] | Senior Notes 6.000% Due 2026 [Member] |  |  |  |  |  |
Long-term debt, interest rate | 6.00% |  | 6.00% |  | 6.00% |
Long-term debt, outstanding principal | $ 700,000 |  | $ 700,000 |  |  |
Long-term debt, unamortized discount | 0 |  | 0 |  |  |
Long-term debt, unamortized original fees and costs | (7,849) |  | (9,244) |  |  |
Long-term debt, net | $ 692,151 |  | $ 690,756 |  |  |
Senior Notes [Member] | The 4.750% Senior NotesDue December 2027 [Member] |  |  |  |  |  |
Long-term debt, interest rate | 4.75% |  | 4.75% | 4.75% |  |
Long-term debt, outstanding principal | $ 1,000,000 |  | $ 1,000,000 |  |  |
Long-term debt, unamortized discount | 0 |  | 0 |  |  |
Long-term debt, unamortized original fees and costs | (13,636) |  | (15,584) |  |  |
Long-term debt, net | $ 986,364 |  | $ 984,416 |  |  |
Senior Notes [Member] | Senior Note 8.625% Due 2025 [Member] |  |  |  |  |  |
Long-term debt, interest rate | 8.625% | 8.625% |  |  |  |
Long-term debt, outstanding principal | $ 600,000 |  |  |  |  |
Long-term debt, unamortized discount | 0 |  |  |  |  |
Long-term debt, unamortized original fees and costs | (10,512) |  |  |  |  |
Long-term debt, net | $ 589,488 |  |  |  |  |
Other Long-Term Debt [Member] |  |  |  |  |  |
Long-term debt, interest rate | 6.137% |  | 11.138% |  |  |
Long-term debt, outstanding principal | $ 3,638 |  | $ 58,322 |  |  |
Long-term debt, unamortized discount | 0 |  | 0 |  |  |
Long-term debt, unamortized original fees and costs | 0 |  | 0 |  |  |
Long-term debt, net | $ 3,638 |  | $ 58,322 |  |  |

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